Tool-grinder for engraving-machines.



No. 645,!65. Patented Mar. 13,1900.

N. DEDRICK. TOOL GRINDER FOR ENGRAVINGMACHINES.

(Application filed. Jan. 16, 1899.) (No flodel.) 5 Sheets-Sheet l.

No. 645,165. Patented Mar. l3, I900. N. DEDBICK.

TOOL GRINDER FOR ENGRAVING MACHINES.

(Applies-flan filed. Jan. 16, 1899.)

5 Sheets-Shoat 2.

(No Model.)

No. 645,!65. Pat ented Mar. l3, I900.

' N. DEDBlGK.

TOOL GRINDER FOR ENGRAVING MACHINES.

(Application filed Jan. 16, 1899.)

5 Sheds-Sheet 3.

(No Model.)

m: Nonms PET No. 645,!65. Patented Mar. |a,|9o'0. N. DEDRICK.

TOOL GRINDER FOR ENGRAVING MACHINES.

( Application filed. Jan 16, 1899.)

5 Sheets-Shoat 4.

(No Model.)

AM!!! A [g I I fa: mmaysrzns w, mm'c-uma. mwmsrun. c. c.

No. 645,|G5. v Patented mar. I3, 1900.,

n. DEDRICK.

TOOL GRINDER FOR ENGRAVING MACHINES.

(Application filed Jan. 16, 1899) 5 Sheets-Sheet '5;

. (No Model.)

' Fig. 2.

UNITED STATES PATENT OFFICE.

NICHOLAS DEDRIOK, OF MANITOWO C, \VISCONSIN.

TOOL-GRINDER FOR ENGRAVING-MACHIN ES.

SPECIFICATION forming part of Letters Patent No. 645,165, dated March 13, 1900.

Application filed January 16, 1899. Serial No. 702,324. (No model.)

To all whom it may concern:

Be it known that I, NICHOLAS DEDRICK, a citizen of the United States, residing at Manitowoc,county of Manitowoc,and State of Wisconsin, have invented certain new and useful Improvements in Tool-Grinders for EngravingMachines, of which the following is a specification.

This invention is designed to provide improved means for grinding the tools which are to be used in a punch or matrix cutting or engraving machine of the general class and type of that shown in Patent No. 614,845, dated November 29, 1898. I have customarily mounted the mechanism of my present invention on the main table of the engraving-machine and driven by the tool-grinder from the drivingshaft of the engravingmachine, and in the drawings I have shown the support consisting simply of such table.

In the drawings, Figure l is a plan of my improved tool-grinder, the same being shown mounted at one corner of the engraving-machine table, the tool-holder being shown in position parallel with the axis of rotation of the grinder. Fig. 2 is a similar plan showing the tool-holder adjusted to oblique position with respect to the grinder-axis. Fig. 3 is a front elevation of the same corresponding to Fig. 1 in respect to the position of the parts. Fig. 4 is a section at the line 4 4 on Fig. 3. Fig. 5 is a section at the line 5 5 on Fig. 3. Fig. 6 is a detail section at the line 6 6 on Fig. 7 is a detail plan of a corner of the table, showing the bottom slide-plate of the tool-holder mechanism and the bracket for the grinder stripped of all mechanism on a reduced scale. Fig. Sis a detail section at the line 8 8 on Fig. 2. Fig. 9 is a detail plan of a cam for governing the movement of the tool-holder according to the form of the cutting-point of the tool, the same being shown on a slide-bar upon which it is carried. Fig. 10 is an axial vertical section of the toolholder, showing the tool-chuck therein. Fig. 11 is a detail section at the line 11 11 on Fig. 3. Fig. 12 is a detail section at the line 12 12 on Fig. 3. Fig. 13 is a face elevation of the part Q,which appears in edge view adjacent to the line 12 12 on Fig. 3. Figs. let, 15, and 16 are detail elevations of terminals of cutters of different form.

' A is the table upon which the grinding mechanism is mounted.

B is the standard in which the grinder= spindle is journaled.

, O is the base-plate upon which the chuck holding and adjustable mechanism is mounted.

B is the grinder; b, the driving shaft or spindle; E the pulley on said shaft, which is driven by a belt 19 from any suitable source of power.

The base-plate O has a fore-and-aft dovetailed rib C, which constitutes a slide bearing or guide for the fore-and-aft primary traveler D, which has a dovetailed channel D in its lower face adapting it to slide on the dovetailed rib C, a gib d being provided for the purpose of taking up lost motion and preserving accuracy in the movement. The traveler D has upon the upper side the dovetailed rib D, transverse to channel D, to guide and retainthe right and left or secondary traveler E, which is provided with a suit able dovetailed channel in its lower face and a gib e for the purpose of taking up lost motion at the slide-joint. traveler E there is mounted the interiorly-tapering upright sleeve or spindle-bearing E, and thereat there is pivotally mounted on said traveler the horizontally-dovetailed slide= bar F, whose tapering spindle F is seated in said spindle-bearin g or sleeve E and retained by the bolt e, inserted axially through the spindle and engaging the flanged nut E which is lodged in suitable counterbored recess at the lower end of the sleeve or spindlebearing. On the slide-bar F there is mounted the sliding bracket G, having a suitable dovetailed channel G in its lower face to adapt it to receive and slide on the slide-bar. This sliding bracket comprises the tool-chuckholder clamp G, which is a horizontal sleeve rifted longitudinally at the upper side and provided with lugs g g for clamp-screws G Upon the secondary.

by which the sleeve may be slightly closed up to cause it to grip and hold firmly the chuck-holder H. The bar F, with its spindle F, and the bracket G, with the clamp-sleeve G, constitute a two-part carriage, which is swiveled on the secondary traveler E at the spindle-bearing E. The chuck-holder H is also in the form of a sleeve, through which the tool-chuck J, which is shown with the tool in it, may be inserted and from which the tool protrudes at the forward end. The chuck J is here shown of the form used in my machine shown in my said Patent No. 614,845, and it is designed to be secured in place in the chuck-holder H by means of the nut J, by which it is secured in place in the chuck-holder of the machine, and the end of the chuck-holder H is exteriorly threaded at h to receive the nut J, the tapering end J of the chuck being set in the tapering seat 11 of the chuck-holder by screwing the nut J onto the threaded end 72 of the holder, the jaws of the chuck being in the same process clamped tightly onto the tool, this being substantially the operation when the chuck, with the tool in it, is secured in the engraving-machine. The chuck has a feather or key 7' at the right-hand end, which engages a slot or key-seatj in the chuck-holder, whereby its position in the chuck-holder is determined and rendered invariable.

H is a-stop-collar on the chuck-holder H, which stops against the left-hand end of the clamp-sleeve G.

P is a collar which is held non-rotatable on the chuck-holder sleeve H by the key p engaging the key-seat 7b in the sleeve H. It is provided with a set-screw 38 and is designed to be secured abutting against the right-hand end of the chuck-holder clamp. The collar has a flange P, the left-hand face of which is rabbeted to form the shoulder 19, and on this shoulder there is seated an annular disk Q, whose outer circumference coincides with that of the flange P of the collar. The flange P has two diametrically-opposite curved slots 19 p and into the disk there are set diametrically-opposite stud-screws q g which are inserted through the slots 12 and provided with washers q, engaged under the heads of the screws, whereby the screws are adapted to bind the annular disk to the flange at any position to which it may be adjusted within the range of adjustment permitted by the length of the curved slots. The periphery of the collar P has two series of notches, the first series consisting of four notches P P P P, ninety degrees apart, and the second series consisting of three notches P P P, one hundred and twenty degrees apart. The purpose of this arrangement of notches is not interfered with by using one notch on the collar in both seriesthat is, starting the two series from the same pointand this course is followed, the notch P? being in both series. The annular disk Q has also two series of notches, one consisting of four notches, separated by ninety degrees interval, Q Q, Q Q, and the other consist ing of three notches, separated by one hundred and twenty degrees interval, Q Q" Q. The relative locations, however, of the two series of notches on the disk Q and on the flange P are not the same-that is to say, when the intervals between the notches of the series of four on the disk coincide with the corresponding series of four on the flange the intervals between the notches of the other series of three on the parts, respectively, do not coincide, and, vice versa, when the disk is rotated so as to make the intervals between the series of three notches on the two parts coincide the intervals between the notches in the series of four do not coincide. The length of the slots 12 in the flange P is such as to permit adjustment of the annular disk with respect to the flange through a sufficient angle to shift the notches from the position at which the series of four coincide to the position at which the series of three coincide, and the screws Q10 being set tight the two parts are secured rigidly together at either position of this range of adjustment.

From the forward side of the clamp-sleeve G of the chuck-holder carriage a boss G projects forwardly and is offset to the right, so as to overhang or project beyond the periphery of the flange P and the annular disk Q. The overhanging or odset portion of this lug is longitudinally apertured to receive the stem of a plunger Q which has a taper-pointed head 1 and the said portion of the lug is ad ditionally counterbored to accommodate beside the head q a coil-spring Q coiled about the stem of the plunger back of the head and reacting against the latter, with atendency to force the pointed terminal of the same inward. A thumb-nutQ, screwed onto the outwardlyprotruding end of the plunger, serves both to check the inward movement, which it is the tendency of the spring to cause, and to afford means for withdrawing the plunger against the pressure of the spring. The pointed head of the plunger Q cannot engage the notches except when those on the flange and disk coincide. When, therefore, the adjustment of the two parts,as described,is such as to cause the series of four to coincide, the collar, being rotated from one point of engagement to the next, is turned ninety degrees, and,ha ving been originally setso that one face of a four-faced tool is exposed properly to the grinder, each of the other four faces will be brought into proper position as the chuckholder is rotated in the clamp-sleeve from notch to notch of the notches which are exposed to engagement with the plunger, and the plunger, entering each notch in turn, will hold the chuck-holder in proper position to expose the face of the tool properly to the grinder, and in this position, the clamp-sleeve being tightened, will secure the parts during the dressing of the face thus exposed. In like manner when a three-cornered tool is being dressed the adjustment of the disk and flange will be such as to cause the notches of the series of three to register, and thereby in a similar manner the three faces of the tool may be successively brought accurately to the grinder. 7

At the left-hand side of the slide G there is pivotally attached thereto by the screw k the TIO bar K, which carries in one end an adjustable gage-screw K. A stud Kiwhich projects from the side of the slide G a short distance back of the pivot-screw It, serves to stop the bar K in either of two positions, in one of which the gage-screw stands in line with the center of the tool-chuck, as seen in Fig. 1, the tail or opposite end K of the bar being stopped against the stud K while in the other position the screw is swung back out of line with thetool-chuck, as seen in Fig. 2, and in that position rests on the stud K A nut K on the gage-screw K may be set up hard against the side of the bar K, and thus secure the gage-screw protruding to any desired distance toward the end of the tool-chuck. The traveler D is arranged to be moved fore and aft on the base-plate O by means of the screw or threaded shaft 1,which passes through a lug 2, which projects upward from the bottom of a fore-and-aft channel 3 in the dovetailed rib O of the base-plate 0. (See Figs. 5 and 7.) In this lug there is formed a recess 4, in which are lodged a nut 5 and a spring 6, interposed between the rear face of the nut and rear wall of the recess and operating to hold the nut against the forward wall. The screw or threaded shaft 1 is screwed through this nut and at the forward end extends through a bearing provided for it in the boss D which projects forwardly from the forward edge of the traveler D and extends downwardly in front of the forward edge of the base-plate C, so that it is in line with the lug 2 and in position to receive the forward end of the shaft 1, as described. On said shaft there is a stop boss or collar S, and in the depending boss D there is a rearwardly-open cylindrical recess D in which is lodged a spring 9, which reacts between the forward end or bottom of the recess and the stop boss or collar 8 on the shaft, tending to hold the shaft rearward with respect to the traveler D. At the forward end the shaft 1 is provided with a knurled thumb-nut 10,

screwed fast onto it, by which it may be rotated, and thusscrewed back or forward through the nut 5. The spring 9 tends, itwill be seen, to hold the shoulder of the thumbnut snugly against the end of the boss D but the spring 6 permits longitudinal movement of the screw with respect to the slide under certain conditions, hereinafter specified, and for the purpose of which the parts are thus constructed. On the rear end of the shaft there is mounted a long sleeve 12, into the rear end of which there is screwed a long adjustin g-screw 13, provided with a set-nut 14, the screw being long enough to impinge against the rear end of the shaft and limit the depth to which the latter may protrude into the sleeve. The sleeve is exteriorly square and is lodged and retained non-rotatable in the channel of the base-plate C. On the upper side of the sleeve there is provided an abutment in the form of a stud and roll 15, which projects in the path of a cam L, which is secured to the lower side of the rearwardly-projecting arm E of the traveler E. As illustrated, the cam is secured to the arm of the traveler by being first mounted on a plate 16, whose opposite edges are beveled and which enters and fits snugly in a dovetailed groove in the lower face of the arm E arrangement being made for securing it firmly therein by sawing a slit 17 from the bottom of the dovetailed groove upwardlyin the arm E and setting into the latter across the slit a binding-screw 18. By this means the position of the cam L may be adjusted right and left, as may be required for the purpose for which it is provided, as hereinafter explained. The slide E is arranged to be moved right and left on the traveler D by means of a bar M, let into a channel in the upper face of the dovetailed rib D and extending out at the right face at theend of said rib and provided with 2. depending terminal lug M, through which extends a screw N, which is rooted in the right-hand side edge of the traveler D and provided with nuts N N one upon each side of the lug M. In the bar M, at a point where the bar is lodged between the parts D and E, there is a transverse slot m, and upon the upper surface of the traveler E there is pivoted a lever-handle 0, from which near its pivot a stud-pin 0 pro jects downwardly through a slot 19 in the traveler E and engages the slot m in the bar M. The slot 19 is curved in the arc of a circle in which the stud-pin O travelsas the lever is swung about its pivot, and by such movement of the handle it will be seen the traveler E will be moved on the slide-rib D of the slide D. The range of movement provided for is intended to be sufficient to advance the tool past the grinder a distance equal to the taper of the tool or extent of its cutting edge requiring to be dressed. Upon the upper surface of the traveler E, toward the forward edge and parallel therewith, there is formed a dovetailed groove E in which are mounted two stops, each comprising a block 20, a screw 21 having a square taper-shouldered head engaging the dovetailed groove and extending through the block and provided with a thumb-nut 22, by means of which, the screw being slackened, the stop may be adjusted to any position in the length of the slot and secured by tightening the screw. In the upper side of the lug D a stud 23 is set in position to project upward in front of the forward edge of the traveler E, so that the projecting ends of the stops 21 21 may collide with it, whereby the movement of the traveler E longitudinally on the traveler D may be limited. 25 is a post which is secured by means of the squareheaded tapershouldered screw 26 in the same groove E The post is axially bored from the upper end to receive the plunger 27 and the spring 28 underneath it and is transversely slotted at 29 29 to receive the pin 30, which is passed through the slots and is fast in the plunger and also in an exterior knurled sleeve 31, which serves as a means of depressing the plungeragainst the spring. The slots 29 29 limit the upward movement and determine the extreme position of the upwardly-projecting end of the plunger,which is such that it stands in the path of a rib f, which projects downward from the lower face of the bar F.- A cross-pin 33 is set through the lower portion of the post 25, serving as a handle by which it may be rotated slightly to slacken the screw 26 to permit the post to be adjusted along the groove E The cooperation of the plunger 27 and the rib 32 serves to limit the angular movement of the chuck-carriage about the axis of the spindle F in order to cause the tool to stand at an angle to the right and left movement of the carriage, corresponding to the taper of the cutting end of the tool which is to be dressed, as may be understood by reference to Fig. 2. A setscrew 34 in the side of the sleeve E may be employed to temporarily or provisionally secure the two parts in proper relation; but when finally adjusted to the exact position desired the sleeve E itself, which is rifted at the forward side and provided with lugs 36 36 for the purpose, may be clamped tightly about the spindle by means of the screw 37, passing through said lugs.

In using this apparatus the tool-chuck J, taken from the engraving-machine with the tool j held in it and projecting from it, is inserted through the ch uck-holder sleeve H, the latter being in position in the clamp-sleeve G of the chuck-carriage, and the tool-chuck is secured to the chuck-holder by means ofthe nut J engaging the threaded end h of the chuck-holder, this process forcing the tapered end of the chuck into the tapered seat of the holder at the left-hand end of the latter and causing the chuck to tightly grip the tool at that end. The slide-bar F being adjusted by turning at its spindle-bearing to a directly fore-and-aft position, so that the tool extends parallel with the right and left side movements of the carriage, and the carriage being adjusted on the slide-bar F to such position that the tool may be extended to the left past the cutting-periphery of the grinder without encountering the latter, the gage-screw K is set at the position shown in Fig. 1 in line with the axis of the tool and the chuck-holder is advanced through the cla nap-sleeve until the point of the tool is stopped by the gage-screw.

The handle 0 being swung to the position shown in Fig. 1, thus setting the slide E and the carriage at the extreme left-h and position within the range of adjustment which may be efiected by the handle, the nuts N N are manipulated to cause the travelerE and carriage to be moved in such direction and to such distance as will bring the base of the taper of the cutting portion on the tool opposite the extreme right-hand margin of the cutting-periphery of the grinder, or if the tool has a cutting end of any other form than tapered to bring opposite the said right-hand margin of the cutting-periphery of the grinder a point on the tool distant from the end as far as it is necessary to extend the dressing or grinding. Theleft-hand stop 20 is now set over. against the stud 23, so that it will limit the movement toward the left at this position. The stop-collar H is then secured by its set-screw on the left-hand protruding end of the chuck-holder, and the collar P is likewise set up against the right-hand end of the clamp-sleeve and secured by the set-screw 38. back out of operative position into the position shown in Fig. 2, the handle 0 will be swung around to the right to the position shown in Fig. 2 and the carriage adjusted about the axis of the spindle to an angle corresponding to the taper to be produced or dressed on the tool. The stop-post 25 is now adjusted and secured on the traveler E at a position at which the rib f is stopped against theupper edge of the plunger 27 in the stoppost. The carriage will now be adjusted in a fore-and-aft direction by means of the screwshaft 1 suificiently to bring the tool within range of the cutting-periphery of the grinder. The handle 0 being now swung around to the left, the traveler E and the carriage will be moved in a direction to advance the tool past the cutting edge of the grinder, causing the latter to operate upon it. The extent to which the tool is dressed will be regulated by means of the screw-shaft 1, which will be turned to move the carriage rearward to whatever extent it is necessay to dress away the tool, the amount of this adjustment being indicated accurately and observed by the micrometer-scale on the neck of the thumbnut 10, so that a precisely-equal amount of work may be done on each of the faces of the tool, so as to preserve the apex on the axis. The collar P throughout all the foregoing adjustments is retained by the engagement of the plunger Q with the notch on the flange of the collar and the annular disk Q being adjusted so as to cause the notches P or P to be suitably registered with the corresponding notches Q or Q, according to whether the tool is quadrilateral or tria ngularin crosssection at the cutting portion, and after each face is properly dressed the chuck-holder will be rotated in the clamp-sleeve to the next notch of the flange P, thus bringing a new face in position to be operated upon, the thumb-nut 10 being in each instance set back to the starting-point and being advanced in each instance to the same extent before passing to the next face of the tool, or each face of the tool may be first dressed without changing the adjustment of the screw-shaft 1, and then suitable change being made to advance the carriage all the faces may be again dressed, and so on until the tool is in proper condition.

In any case in which the tool has or is to be given a form varying in any respect from a straight taper the special form is produced by means of the cam L, which is shaped at The gage-screw K being now thrownone edge or the other suitably to produce the special form, as will now be described. One special form which is frequently desirable is illustrated in Fig. 18, wherein the tool is shown exaggerated in size. The peculiarity of this form consists in the somewhat abrupt rounding off of the tool at the point. The dotted lines continuing the taper of the tool in this figure in comparison with the full lines which show the actual outline of the tool in this form indicate the departure which must be made from the direct movement of the carriage, which would produce the straight or continued taper to the end. This change in the movement, it will be seen, will consist in introducing a slight rearward movement of the carriage and tool in conjunction with the movement of the carriage to the right and a corresponding forward movement in conjunction with the movement of the carriage to the left at the time when the portion of the tool which has the special form is exposed to the action of the grinder. Such special movement of the carriage is produced by the encounter of the abutment on the upper side of the sleeve 12, as already described, with the cam slope L of the cam L, which is mounted on the under side of the arm E of the traveler E, such enounter in the movement of the carriage to the right causing, as will be seen, the traveler E and the carriage thereon to be forced rearward, moving the travelerD rearward to the extent of the cam slope beslope L.

lowing of the cutting-faces.

Another special form of tool which it is sometimes desired to produce and dress in this machine is shown at Fig. 19, the special peculiarity of which consists in the concave hol- This form is produced in a manner precisely similar to that above described by reversing the cam L on the plate 16, so as to bring the convexlycurved protuberance L on the opposite edge from the cam slope L in position to encounter the abutment 15. The screw 13, it will be seen, affords means for adjusting the abutment 15 relatively to the cam L, so as to produce these special movements at precisely the right point to form the tool as desired, and when the special movements are not desired the screw 13 may be withdrawn far enough to leave the abutment 15 out of range of the cam, so that it produces no effect, or the plate 16 may be moved longitudinally to leave only a straight edge of the cam in the part of the abutment.

For the purpose of cutting or dressing a tool whose working portion shall be tapered from a point in convex curves, as illustrated in Fig. 20, the carriage being adjusted to oblique position, as in Fig. 2, the chuck-holder is advanced to the clamp-sleeve to bring the point of the tool a little farther from the axis of the spindle than said axis is from the cutting-periphery of the grinder, so that as the carriage is swung about the spindle the protruding end of the tool will be swung past said cutting-periphery in an are about said axis and the tool will be dressed in such arc. The radius of curvature of this arc may be made longer or shorter by adjusting the-carriage G on the slide-bar F backward or forward. This will necessitate a corresponding adjustment of the slide E to bring the toolaxis in proper relation to the cutting-periphery of the grinder.

In the foregoing description and in my claims I have used the term grinder to indicate the element of the machine which operates upon the tool to dress or cut it in any manner or to polish it, and I do not intend to be limited by the use of that word to an element which operates strictly after the manner which might betermed grinding, but, on the contrary, I include under that term any cutting, dressing, and polishing.

I claim 1. In a tool-grinding machine, in combination with the grinder, a tool-carriage; a traveler on which the carriage is swiveled; means for adjusting the carriage angularly at the swivel-pivot; means for moving the traveler to advance and withdraw the tool with respect to the grinder; and adjustable stops to limit the range of such movements.

2. In a tool-grinding machine, in combination with the grinder; a tool-carriage; a traveler on which the carriage is swiveled means for adjusting the traveler to advance and withdraw the tool with respect to the grinder; means for oscillating the carriage about its swivel-pivot, and adjustable stops to limit the range of such oscillation.

3. In a tool-grinding machine, in combination with the grinder; a traveler; a two-part tool-carriage having one part swiveled on the traveler and means for adjusting it about the swivel-axis, the other part having the toolseat and being adjustable on the swivel part radially with respect to the swivel-axis; and means for moving the traveler to advance and withdraw the tool with respect to the grinder.

4. In a tool-cutting machine, a compound universally-ad j ustable tool-carriage support consisting of a primary and a secondarytraveler movable in directions transverse to each other; a two-part tool-carriage of which one part is swiveled on the secondary traveler, and the other part is radially adjustable on IIO the swiveled part; means for adjusting one of the travelers in its line of movement, and means for moving the other traveler to advance and withdraw the tool with respect to the grinder.

5. In a tool-grinding machine, acompound universally-adjustable tool-carriage support consisting of a primary and secondary traveler movable in directions transverse to each other; a tool-carriage swiveled on the secondary traveler and adapted to be oscillated about its swivel-pivot; means for adjusting the primary and secondary travelers in their respective lines of movement, and adj ustabe stops to limit the range of oscillation of the swiveled carriage.

6. In a tool-grinding machine, a compound universally-adjustable tool-carriage support consisting of a primary and a secondary traveler movable in directions transverse to each other; suitable means for adjusting said travelers in their respective lines of movement; a tool-carriage swiveled on the secondary traveler, and suitable means for adj usting and securing it axially about its swivel-axis; means for moving said secondary traveler at will in its line of movement to advance and Withdraw the tool with respect to the grinder, and stops to limit the range of such movement.

7. In a tool-grinding machine, in combination with the grinder; a two-part tool-carriage, one part being sWiveled on its support and the other part having the tool-seat being adjustable radially With respect to the swivelaxis; suitable means for adjusting said second part with respect to the first; means for oscillatingthe entire carriage about its swivelaxis, and adjustable stops to limit its range of oscillation.

8. In a tool-dressing machine, in combination with the grinder, a compound support for the tool consisting of a fixed base and transversely-operating primary and secondary travelers, the tool-seat being mounted on the secondary traveler; means for adjusting one of the travelers in its line of movement; a yielding stop for such adjustment; means for moving the other traveler to advance the tool with respect to the grinder, and a cooperating cam and abutment, one on said traveler and the otheron the fixed base; whereby the tool is swerved from the line of movement of said traveler.

9. In a tool-dressing machine, in co mbination with a grinder, a compoundsupport for the tool consisting of a base and transverselyoperating primary and secondary travelers; a tool-carriage swiveled and angularly adjustable on the secondary traveler; means for adjusting one of the travelers in its line of movement; a yielding stop for such adjustment; means for moving the other traveler to ad vance and withdraw it with respect to the grinder, and a cooperating cam and abutment, one on said traveler and the other on the fixed base, by which the tool is swerved from the line of movement of said traveler.

10. In a tool-dressing machine, in combination with a grinder, a compound support for the tool consisting of a fixed base and transverselyoperating primary and secondary travelers, a two-part tool-carriage, and one part being swiveled and angnlarly adjustable V on the first movable radially with respect to the swivel-axis.

11. In a tool-dressing machine, in combination with the grinder, a compound support for the tool consisting of a fixed base, and transversely operating primary and secondary travelers; the tool-seat being mounted on the secondary traveler; means for adjusting the primary traveler in its line of movement, and a yielding stop for such adjustment, and means for moving the secondary traveler to advance and withdraw the tool with respect to the cutter; and a cooperating cam and abutmen t, one supported on the fixed base and the other on the secondary traveler, whereby the tool is swerved from the line of movement of said traveler.

12. In a tool-dressing machine, in combina tion with the grinder, a compound support for the tool consisting of a fixed base and transversely operating primary and secondary travelers, thetool-seat being mounted on the secondary traveler; a screw-shaft threaded through the base, and suitable cooperating stops on the shaft and on the primary traveler to cause the shaft to adjust said traveler, one of said stops being yielding in one direction; a cooperating cam and abutment, one on the secondary traveler and the other stopped longitudinally with respect to said screW-shaft,said cam and abutmentbein g con structed and arranged to become engaged by the movement of the secondary traveler, whereby such movement causes the primary traveler to be moved in the direction per mitted by said yielding stop.

13. In a tool-d ressin g machine, in combination with the grinder, acompound support for the tool consisting of a fixed base and transversely operating primary and secondary travelers, the tool-seat being mounted upon the secondary traveler, the screw --shaft 1, threaded through the fixed base; abutments on said screw-shaft and on the primary traveler constructed and arranged to cause the shaft to adjust the traveler fore and aft; a sleeve 12 on the screw-shaft; a cooperating cam and abutment, one on the secondary traveler and the other on said sleeve; and. the adjusting-screw 13 for adjusting the sleeve with respect to the screw-shaft.

14. In a tool-dressing machine, in combination with the tool-carriage, the tool chuckholder seated therein; a collar on such holder non-rotatable with respect thereto and havin ga plurality of series of peripheral notches, the several series consisting of different numbers of notches a blinder or shoulder-washer adjacent to said collarhavingasimilar plural- In testimony whereof I have hereunto set ity of series of notches, the relative disposimy hand, in the presence of two witnesses, at 10 tion of the several series of fiotches on the Chicago, Illinois, this 3d day of January, 1898. washerbeing different from t 0 relative disposition of the corresponding series on the NICHOLAS DEDRICK collar, whereby when one series on the collar Witnesses: corresponds with one series on the washer, the L. DEDRICK, other series on the two parts do not coincide. C. M. DEDRICK. 

